code.js

// Please note only Node.js code is supported here
console.log('We have a message query=%j and body=%j', msg.query || {}, msg.body || {});
if (msg.query && msg.body) {
    msg.body.__query = msg.query;
}
// Emit the data event
emitter.emit('data', msg);
// No need to emit end
console.log('Finished execution');

sample.json

{
  "__query" : {
    "foo":"bar",
    "value":"123"
  }
}